read txt file data in C# in datatable

public Tuple<List<FieldImports>, bool> ReadTxtFile(string filePath)
        {
            string[] textData = System.IO.File.ReadAllLines(filePath);
            string[] headers = textData[0].Split('\t');
            DataTable dataTable1 = new DataTable();
            foreach (string header in headers)
                dataTable1.Columns.Add(header, typeof(string), null);
            for (int i = 1; i < textData.Length; i++)
            {
                dataTable1.Rows.Add(textData[i].Split('\t'));
            }
            List<FieldImports> listDataColumn1 = new List<FieldImports>();
            var columnNames = dataTable1.Columns.Cast<DataColumn>()
               .Select(c => c.ColumnName)
               .ToList();

            List<FileDataModel> listDataResult = new List<FileDataModel>();
            for (int columnIndex = 0; columnIndex < dataTable1.Columns.Count; columnIndex++)
            {
                List<FieldImports> listData = new List<FieldImports>();
                FieldImports result = new FieldImports();
                // result.ColumnName = dataTable1.Rows[i][i].ToString();
                result.ColumnName = Convert.ToString(dataTable1.Rows[0][columnIndex]);
                listData.Add(result);
            }
            //listDataResult.Add(listData);
            for (int rowIndex = 0; rowIndex < dataTable1.Rows.Count; rowIndex++)
            {
                List<FieldImports> listData = new List<FieldImports>();
                for (int columnIndex = 0; columnIndex < dataTable1.Columns.Count; columnIndex++)
                {
                    FieldImports result = new FieldImports();
                    // result.ColumnName = dataTable1.Rows[i][i].ToString();
                    result.ColumnValue = Convert.ToString(dataTable1.Rows[rowIndex][columnIndex]);
                    listData.Add(result);  
                }
                listDataResult.Add(listData);
            }
        
         // return new Tuple<List<FieldImports>, bool>(columnListData, false);
            return null;
        }
    }